Random copolymer oil return agents

a technology of oil return agent and copolymer, which is applied in the direction of lubricant composition, heat exchange element, chemistry apparatus and processes, etc., can solve the problems of reducing efficiency, poor lubrication, and lack of miscibility with traditional lubricants such as mineral oils, so as to improve the oil return and system performance of refrigeration systems, effectively compatibilize mineral oils, and increase the miscibility of lubricants

Active Publication Date: 2015-06-23
ARKEMA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The present invention provides for polymeric oil-return agents that increase the miscibility of lubricants such as mineral oils and / or oxygenated lubricants with halogenated refrigerants, including hydrofluorocarbon (HFC) and hydrofluoroolefin (HFO) refrigerants, in order to improve oil return and system performance of refrigeration systems. It was discovered that random copolymers containing less than about 30 wt % fluorine can effectively compatibilize mineral oils and / or oxygenated lubricant oils with HFC refrigerants. It was discovered that the polymeric oil-return agents of the present invention could be suddessfully used to improve the misciblity and oil-return in systems of non-chlorine-containing refrigerants and non-oxygenated lubricants without the need of the solubilizing agents. The random copolymers comprise at least one monomer, A, providing compatibility with the oil phase, and at least one monomer, B, providing compatibility with the refrigerant phase.

Problems solved by technology

In a system with poor oil return, the oil that leaves the compressor collects at various points in the refrigeration system and does not return to the compressor, leading to clogging, poor lubrication, and decreased efficiency.
HFCs, however, lack the miscibility with traditional lubricants such as mineral oils necessary to provide adequate performance.
These new lubricants can be considerably more expensive than traditional mineral oil lubricants and can be extremely hygroscopic.
Their combination with water can result in the undesirable formation of acids that can corrode parts of the refrigeration system and lead to the foramtion of sludges.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036]50 mL of toluene were heated in a 100 ml jacketed reactor with mechanical stirrer, nitrogen inlet, condenser and feed port. Into a 4 oz jar, 10.5 g of butyl acetate, 10.0 g butyl acrylate, 40.0 g lauryl acrylate, and 0.91 g of LUPEROX® 575 (organic peroxide polymerization initiator available from Arkema Inc.) were weighed and primed through a metering pump. Butyl acetate is a non-reactive solvent used as an internal standard for monitoring monomer conversion. When the temperature of the toluene reached 104° C., the feed was started. Feed was complete at 80 minutes and conversion was 93.9%. The reaction was heated to 110° C. and held for 3 hours. Final conversion was 98%. The synthesized polymer contained a monomer composition of 20% butyl acrylate and 80% lauryl methacrylate and an overall molecular weight of Mn=6.2 kg / mol and Mw=11.4 kg / mol as determined by GPC. The polymer is further designated as P(BA / 10-r-LA / 80)-6

example 2

[0037]50 mL of toluene were heated in a 100 ml jacketed reactor with mechanical stirrer, nitrogen inlet, condenser and feed port. Into a 4 oz jar, 10.0 g of butyl acetate (internal standard), 25.0 g butyl acrylate, 25.0 g lauryl acrylate, and 0.91 g of LUPEROX® 575 were weighed and primed through a metering pump. When the temperature of the toluene reached 104° C., the feed was started. Feed was complete at 80 minutes and conversion was 93.9%. The reaction was heated to 110° C. and held for 3 hours. Final conversion was 98%. The synthesized polymer contained a monomer composition of 20% butyl acrylate and 80% lauryl methacrylate and an overall molecular weight of Mn=6.6 kg / mol and Mw=13.5 kg / mol as determined by GPC. The polymer is further designated as P(BA / 50-r-LA / 50)-7

Lubricant Preparation:

[0038]Lubricants were prepared by blending a fraction of a polymeric oil-return agent to mineral oil (MO-150). Blending could be assisted with gentle heating. Blends were prepared from 0 wt % t...

example 4

[0041]A lubricant was prepared with 5.5 wt % of the P(BA / 20-r-LA / 80)-6 of example 1 in MO-150. The lubricant was tested using refrigerant / oil miscibility test described previously using R-404A as the refrigerant. The miscibility limit was between 8.5 wt % and 10.0 wt % R-404A in lubricant.

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PUM

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Abstract

The present invention relates to polymeric oil-return agents which solubilize or disperse mineral oil and / or synthetic oil lubricants with hydrofluorocarbon, hydrochlorofluorocarbon, and hydrofluoroolefin-based refrigerants and refrigerant compositions containing them. The polymeric oil-return agents are random copolymers containing less than about 30 wt % fluorine and produced from at least one monomer providing compatibility with the oil phase and at least one monomer providing compatibility with the refrigerant phase. The polymeric oil-return agents provide for more efficient return of mineral oil and / or synthetic oil lubricants from non-compressor zones back to a compressor zone in a refrigeration system.

Description

FIELD OF THE INVENTION[0001]The present invention relates to polymeric oil-return agents which solubilize or disperse mineral oil and / or synthetic oil lubricants with hydrofluorocarbon, hydrochlorofluorocarbon, and hydrofluoroolefin-based refrigerants and refrigerant compositions containing them. The polymeric oil-return agents are random copolymers containing less than about 30 wt % fluorine and produced from at least one monomer providing compatibility with the oil phase and at least one monomer providing compatibility with the refrigerant phase. The polymeric oil-return agents provide for more efficient return of mineral oil and / or synthetic oil lubricants from non-compressor zones back to a compressor zone in a refrigeration system.BACKGROUND OF THE INVENTION[0002]Most refrigeration compressors use mineral oil lubricants with chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) refrigerants. In addition to being inexpensive and rugged lubricants, mineral oils are miscible...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C09K5/04C10M145/14C10M171/00
CPCC09K5/045C10M171/008C09K2205/12C10M2203/1025C10M2203/1045C10M2203/1065C10M2205/0285C10M2205/143C10M2205/223C10M2207/2835C10M2209/084C10N2220/021C10N2220/302C10N2220/303C10N2240/30C10M2213/04C10N2020/04C10N2020/101C10N2020/103C10N2040/30
Inventor VAN HORN, BRETT L.BERTELO, CHRISTOPHER A.SCHMIDT, SCOTT C.MACY, NOAH E.PAPAKONSTANTOPOULOS, GEORGE J.
Owner ARKEMA INC
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